Nowadays in the software development environment SMEs occupies a considerable percentage of the number of companies. SME's generate the 52% of the gross domestic product of the countries and around 72% of the formal employees. For this reason, it is important to guarantee the quality of SME´s products improving the quality of processes used to develop them. However, SMEs suffer lack of implementation of formal processes for the software development. This paper shows the research results that aim to establish a characterization of SMEs, so the needs that SMEs face in the implementation of software process improvement are highlighted. To achieve this, a systematic review protocol was performed. The application of this protocol has allowed to identify the effort regarding to software process improvement and the main limitations faced by SMEs. Besides, the paper emphasizes the advantages and benefits that an organization gets with the implementation of software processes improvement.

Resumen: Actualmente en el ámbito del desarrollo de software a nivel mundial las pymes ocupan un considerable porcentaje del número de empresas generando el 52% del producto interno bruto de los países y alrededor del 72% de los empleados formales. Sin embargo, aun cuando es importante asegurar la calidad en sus productos, existe una carencia en la implementación de procesos o modelos formales enfocados en el desarrollo de software que las ayuden a las organizaciones a dirigir esta necesidad. Este artículo muestra una comparativa entre teoría y realidad de la caracterización de necesidades que presentan las pymes para implementar una mejora de procesos de software exitosa. En específico el estudio presentado en este artículo se centra en la Región de Zacatecas, México y los resultados obtenidos al realizar una revisión de literatura enfocada en la caracterización de pymes. Palabras-clave: Pymes; mejora de procesos de software; necesidades de SPI en Pymes; modelos y estándares de calidad; revisión literaria. Characterizing SME's needs for implementing a software process improvement: A comparative between the reality and the theory Abstract: Nowadays in the software development industry SMEs occupy a considerable percentage of the number of companies generating the 52% of the gross domestic product of the countries and around 72% of the formal employees. However, even when guarantee the software quality is important for SMEs, they have a lack in the implementation of software development formal processes that help them to address this need. This paper shows a comparative between reality and theory focused on the characterization of the needs that SMEs have to face when implementing a software process improvement. The paper is focused on showing the results of analyzing SMEs from Zacatecas Region of Mexico and the results obtained performing a systematic review results and the SME's from Zacatecas Region results are included.

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